Alert archive / Texas / Special Weather Statements in 2020

Special Weather Statement, NWS Austin/San Antonio, TX

April 9, 2020Dimmit County, Texas

NWS Austin/San Antonio, TX issued this special weather statement at Apr 9, 2020, 4:11 PM CDT for Dimmit County, Texas. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 9, 2020, 4:11 PM CDT (21:11 UTC)
Expired: Apr 9, 2020, 5:00 PM CDT
In force: 49 min
Issued by: NWS Austin/San Antonio, TX

County Dimmit County, TX

The radar

The Laughlin AFB radar (KDFX), 108 km from the middle of the area, began a volume at 21:14 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 9.2 hours before the alert went out and 157 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2030 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 1296 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before this special weather statement went out at Apr 9, 2:32 PM CDT, 1 hour 39 minutes earlier.

Area forecast discussion, Apr 9, 2:32 PM CDT, 1 hour 39 minutes before

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
232 PM CDT Thu Apr 9 2020

.SHORT TERM (Tonight through Friday Night)...
Strong to severe storms are firing along a Burnet to Boerne line
early this afternoon and are tracking ENE at 35 mph. With the front
only partially enhancing the storms near and north of Llano, it is
assumed that the explosive storm growth has not fully taken place.
Rapid refresh models have struggle the past couple days on getting
storm initiation points even remotely accurate. Nevertheless we have
active storms, and will a assume watches and warnings are imminent
in the next hour.

Satellite derived layer Pwat imagery seems to suggest this activity
more rooted in a shortwave lifting NE from W Texas toward N-Central
TX, and an 18Z special sounding confirms the front has already
passed the DRT area. So by 4 pm, the front could be more closely
aligned with the lead orientation of the storm clusters. What
appears less likely is that heavy rainfall potential may not need
inclusion for the Hill Country, and some last minute PoP adjustments
may be warranted for the first period.

By 6 pm, the front should have caught up with the leading edge of
storm, and should have moved through most of the Austin/San Antonio
metro areas. Unfortunately some of the best ingredients of high CAPE
and strong shear will be available to potentially bring some of the
stronger hail and high winds to some of our higher population
densities. The storms should accelerate slightly as the front and
storm complex become aligned, so we are not expected much more than
1 inch from some of the stronger storms. East of the metro area this
evening, we may see some of the hail reports decrease while the wind
reports increase.

By 9 pm, the front should have been through all counties with some
residual rain and storm activity lingering into midnight over
southern counties. A tranquil night should resume after midnight
with the north winds cooling us down into the mid 50s to mid 60s.

More and more, models are trending drier in the wake of the this
evening's activity, so PoPs for Friday are cropped way back from the
blended guidance. There remains a potential for strong storms near
the Rio Grande, but surface based deep convection and anything more
than some small hail is not expected. By late Friday afternoon, the
surface winds turn SE over all of South Central TX; thus Friday
night could see better coverage, but perhaps not much of a boost in
storm strength through 12Z Saturday.

&&

.LONG TERM (Saturday through Thursday)...
The wet weather pattern continues on Saturday as a warm front pushes
into our area from the Gulf waters. Dew point temperatures in the
60s and 70s ahead of a dry-line over the northeast part of Mexico
will set the stage for scattered showers and thunderstorms over most
areas. By Saturday afternoon, the dry-line is forecast to shift to
the east as well as the shower and thunderstorm activity. Some of
these storms could be strong to severe, capable of producing large
hail and damaging wind gusts. In addition, locally heavy rain is
possible.

We may see a break on Saturday afternoon into the early evening
hours across the Rio Grande and Edwards Plateau. However, a second
round of showers and thunderstorms is expected on late Saturday
evening. Some storms could be strong to severe, as an upper level
system over northern Mexico slowly moves to the east and over our
Saturday night into Sunday. Some lingering showers and storms could
affect the northeast part of the Hill Country and areas along
Interstate 35 corridor on Sunday morning, however, weather should
clear from west to east on mid-late Sunday morning. Expect plenty of
sunshine for Sunday afternoon with highs in the mid 70s to mid 80s.

A strong cold front will push across the area on Sunday night into
Monday with lows in the 40s across the Hill Country to the lower 50s
across the Rio Grande. The cooler airmass remains over the area on
Monday with highs in the 60s for most area. Dry weather conditions
persist through the week with a warming trend expected
for the latter part of the week.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              61  72  58  74  63 /  60  -   20  80  80
Austin Bergstrom Intl Airport  61  72  58  75  63 /  70  10  20  80  80
New Braunfels Muni Airport     63  73  58  76  62 /  70  10  20  80  70
Burnet Muni Airport            58  69  56  72  59 /  40  -   20  70  70
Del Rio Intl Airport           64  78  63  85  60 /  20  20  50  20  30
Georgetown Muni Airport        59  71  56  72  61 /  50  -   20  80  80
Hondo Muni Airport             64  75  60  79  60 /  30  20  40  50  60
San Marcos Muni Airport        61  73  58  75  62 /  70  10  20  80  80
La Grange - Fayette Regional   63  73  58  77  66 /  90  10  20  80  80
San Antonio Intl Airport       64  74  60  77  63 /  60  10  20  60  70
Stinson Muni Airport           65  74  60  78  64 /  60  10  20  50  70

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
None.
&&

Short-Term/Aviation...Oaks
Long-Term...17
Decision Support...Treadway

Hazardous weather outlook, Apr 9, 8:32 AM CDT, 7 hours 39 minutes before

Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
832 AM CDT Thu Apr 9 2020

TXZ171>173-183>194-202>209-217>225-228-101345-
Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera-
Gillespie-Kendall-Blanco-Hays-Travis-Bastrop-Lee-Kinney-Uvalde-
Medina-Bexar-Comal-Guadalupe-Caldwell-Fayette-Maverick-Zavala-
Frio-Atascosa-Wilson-Karnes-Gonzales-De Witt-Lavaca-Dimmit-
832 AM CDT Thu Apr 9 2020

This Hazardous Weather Outlook is for South-Central Texas..

.DAY ONE...Today And Tonight.

Scattered to numerous showers and storms are forecast late this
afternoon and evening along a cold front. There is an Enhanced
Risk of severe storms east of a line Llano to Eagle Pass while a
Slight Risk extends farther west to near Del Rio and Junction. The
most intense severe storms will have the potential to produce large
hail 2 inches in diameter or greater as well as damaging wind gusts
of 70 mph or greater. In addition, isolated pockets of heavy rainfall
are possible, which could lead to flooding. Frequent cloud to ground
lightning is likely in these storms.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Another chance for strong to severe storms is possible Saturday
into Sunday.

.SPOTTER INFORMATION STATEMENT...

Please report any severe weather and flooding to the National
Weather Service.

In the hours before

Special weather statement, Apr 9, 3:30 PM CDT, 41 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
330 PM CDT Thu Apr 9 2020

TXZ191-092115-
Hays TX-
330 PM CDT Thu Apr 9 2020

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL HAYS COUNTY UNTIL 415 PM
CDT...

At 330 PM CDT, Doppler radar was tracking a strong thunderstorm over
Wimberley, moving east at 25 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
San Marcos, Kyle, Buda, Wimberley, Woodcreek, Mountain City and Hays
City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
south central Texas.

LAT...LON 3015 9789 2992 9784 2992 9785 2990 9788
      2993 9814 2995 9817 3004 9815
TIME...MOT...LOC 2030Z 265DEG 20KT 2999 9812

Local storm report, Apr 9, 3:35 PM CDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
335 PM CDT THU APR 9 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0300 PM     HAIL             3 N BOERNE              29.84N 98.73W
04/09/2020  E0.50 INCH       KENDALL            TX   PUBLIC

            TIN ROOF PARTIALLY REMOVED FROM BARN, 4 TO 5
            INCH DIAMETER CEDAR LIMBS BROKEN AND 1/2
            INCH DIAMETER HAIL.

&&

EMP

Local storm report, Apr 9, 3:47 PM CDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
347 PM CDT THU APR 9 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0235 PM     TSTM WND GST     1 ESE LIBERTY HILL      30.66N 97.89W
04/09/2020  E60 MPH          WILLIAMSON         TX   AMATEUR RADIO

            WINDS ESTIMATED AT 60 MPH WITH SOME POSSIBLE
            TREE DAMAGE. TIME ESTIMATE VIA RADAR.

&&

AAT

Local storm report, Apr 9, 3:55 PM CDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
355 PM CDT THU APR 9 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0241 PM     TSTM WND DMG     1 SSE GEORGETOWN        30.63N 97.68W
04/09/2020                   WILLIAMSON         TX   BROADCAST MEDIA

            MULTIPLE REPORTS OF POWER OUTAGES FROM
            FLORENCE, GEORGETOWN, AND TAYLOR FROM BOTH
            NEWS MEDIA AND EMS. TIME ESTIMATED VIA RADAR
            OF IMPACTS IN GEORGETOWN.

&&

AAT

Local storm report, Apr 9, 4:00 PM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
400 PM CDT THU APR 9 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0316 PM     TSTM WND DMG     TAYLOR                  30.57N 97.41W
04/09/2020                   WILLIAMSON         TX   EMERGENCY MNGR

            REPORTS OF POWER LINES DOWN AROUND THE CITY
            OF TAYLOR. GUSTY WINDS.

&&

AAT

Special weather statement, Apr 9, 4:11 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
411 PM CDT Thu Apr 9 2020

TXZ218-219-228-092200-
Frio TX-Dimmit TX-Zavala TX-
411 PM CDT Thu Apr 9 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN DIMMIT...
SOUTHEASTERN ZAVALA AND SOUTHWESTERN FRIO COUNTIES UNTIL 500 PM
CDT...

At 411 PM CDT, Doppler radar was tracking a strong thunderstorm over
Big Wells, moving northeast at 20 mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Big Wells, Las Vegas and Brundage.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
south central Texas.

LAT...LON 2853 9976 2886 9943 2865 9927 2864 9928
      2864 9939 2850 9940 2840 9960
TIME...MOT...LOC 2111Z 234DEG 20KT 2855 9958

MO

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 9, 12:30 PM CDT	Special Weather Statement	EWX	Gillespie, Kerr	60 min
Apr 9, 1:18 PM CDT	Special Weather Statement	EWX	Burnet, Llano	57 min
Apr 9, 2:11 PM CDT	Special Weather Statement	EWX	Burnet	64 min
Apr 9, 2:23 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Travis, Williamson	52 min
Apr 9, 2:30 PM CDT	Special Weather Statement	EWX	Kendall	45 min
Apr 9, 2:48 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Hays, Travis	42 min
Apr 9, 2:54 PM CDT	Severe Thunderstorm Warning	EWX	Williamson	36 min
Apr 9, 2:59 PM CDT	Special Weather Statement	EWX	Williamson	61 min
Apr 9, 3:23 PM CDT	Special Weather Statement	EWX	Dimmit	52 min
Apr 9, 3:28 PM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Lee, Williamson	62 min
Apr 9, 3:30 PM CDT	Special Weather Statement	EWX	Hays	45 min
Apr 9, 3:48 PM CDT	Severe Thunderstorm Warning	EWX	Hays	27 min
Apr 9, 5:33 PM CDT	Special Weather Statement	EWX	Frio	57 min
Apr 9, 5:46 PM CDT	Severe Thunderstorm Warning	EWX	Frio	44 min
Apr 9, 6:00 PM CDT	Severe Thunderstorm Warning	EWX	Frio, Medina	30 min
Apr 9, 6:24 PM CDT	Special Weather Statement	EWX	Medina	66 min

Nearby

Special Weather Statements in Texas, 2020 Every special weather statement in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.